I only use 600 greaseless, but I'm looking to get at least two more grits. Not sure exactly what advice you're looking for. The deeper the pits, the easier they will be to remove with lower grit greaseless. If you plan on restoring a lot of blades, in pretty rough shape, get as many grits as you can. If you just wsnt to remove light staining and surface rust, you won't need as many.